lichen spinulosis - Health Topics
The shape of a lichen is usually determined by the organization of the fungal filaments. [36] The nonreproductive tissues, or vegetative body parts, are called the thallus. Lichens are grouped by thallus type, since the thallus is usually the most visually prominent part of the lichen.
Understanding the Context
Lichen, any of about 15,000 species of plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi. They are found worldwide and occur in a variety of environmental conditions. A lichen is a symbiotic relationship between a fungus and a photosynthetic partner (algae, cyanobacteria, or both). Lichens grow all over the world and can even survive exposure to space.
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What Is a Lichen? Definition and Facts - Science Notes and Projects The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruiting bodies. The alga can be either a green alga or a blue-green alga, otherwise known as cyanobacteria. Some lichen contains aromatic substances in their thallus and are used to produce various cosmetics. Cetraria islandica contain carbohydrates in the form of lichenin.
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A lichen is not a single organism; it is a stable symbiotic association between a fungus and algae and/or cyanobacteria. Like all fungi, lichen fungi require carbon as a food source; this is provided by their symbiotic algae and/or cyanobacteria, that are photosynthetic. The first lichen checklist to cover North America was published in 1956 in the regional journal Castanea by Drs. Mason Hale of West Virginia University and William Culberson of Duke University. 3 While geographers consider North America to span 23 countries, for the purposes of their checklist Hale & Culberson defined North America to be the ...